Choosing the right big bore kit for your Harley Davidson Evolution Big Twin can significantly boost performance, but the options vary widely in features, ease of installation, and compatibility. Among the top picks, the V-Twin 11-1253 Evolution 83 stands out for its straightforward bolt-on design and stylish appearance, ideal for those seeking a quick upgrade. The S&S 106 in. Big Bore Black Kit for Harley Davidson 2006-2013 offers a substantial displacement boost for street performance enthusiasts, though it requires mechanical skill. Meanwhile, the S&S Cycle 91-7702 96in. Big Bore Kit provides a hassle-free installation with high-quality materials, best suited for owners wanting a reliable, durable upgrade without case splitting. Each option balances power gains, ease of install, and model compatibility differently, so understanding these tradeoffs is key to making an informed decision.
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Key Takeaways
- The V-Twin 11-1253 offers a simple bolt-on upgrade but may increase engine heat and is limited to specific models.
- The S&S 106-inch kits provide significant power increases but require mechanical knowledge for installation.
- The 96-inch S&S kit emphasizes ease of installation and durability, ideal for owners who prefer a no-fuss upgrade.
- Compatibility varies; some kits are tailored for particular model years, impacting choice for different Harley owners.
- The right big bore kit balances power, ease of installation, and fitment to match the rider’s skill and bike model.
| V-Twin 11-1253 Evolution 83″ Big Bore Cylinder Kit |  | Best Overall Bolt-On Upgrade | Model: 11-1253 | Bore Size: 83 inches | Color: Black | VIEW ON AMAZON | See Our Full Breakdown |
| S&S 106 in. Big Bore Black Kit for Harley Davidson 2006-2013 FXD and Big Twin Models |  | Best for Power Boost in Street Models | Application: 2006-2013 FXD and Big Twin | Displacement: 106 inches | Color: Black | VIEW ON AMAZON | See Our Full Breakdown |
| S&S Cycle 91-7702 96in. Big Bore Kit – Black Powder-Coat |  | Best for Hassle-Free Upgrade | Bore Size: 96 inches | Finish: Black Powder-Coat | Material: Aluminum with cast-in iron liners | VIEW ON AMAZON | See Our Full Breakdown |
| S&S 95 in. Twin Cam Natural Big Bore Kit for Harley Davidson 1999-2006 Twin Cam |  | Best for Classic Twin Cam Upgrades | Displacement: 95 inches | Application: 1999-2006 Twin Cam | Includes: Various components for upgrade | VIEW ON AMAZON | See Our Full Breakdown |
| S&S 106 in. Big Bore Black Kit for Harley Davidson 2006-2013 FXD and Big Twin Models |  | Best for Displacement Boost in Street Models | Application: 2006-2013 FXD and Big Twin | Displacement: 106 inches | VIEW ON AMAZON | See Our Full Breakdown |
| big bore kit for harley davidson evolution big twin | Application | Displacement |
|---|---|---|
| V-Twin 11-1253 Evolution 83" B | — | — |
| S&S 106 in. Big Bore Black Kit | 2006-2013 FXD and Big Twin | 106 inches |
| S&S Cycle 91-7702 96in. Big Bo | — | — |
| S&S 95 in. Twin Cam Natural Bi | 1999-2006 Twin Cam | 95 inches |
| S&S 106 in. Big Bore Black Kit | 2006-2013 FXD and Big Twin | 106 inches |
More Details on Our Top Picks
V-Twin 11-1253 Evolution 83″ Big Bore Cylinder Kit
This kit stands out for its straightforward bolt-on design, making it a popular choice for owners wanting a quick, stylish boost. The 83-inch bore size increases horsepower and torque, delivering noticeable performance improvements. The black finish adds a sleek look that fits well with custom builds. However, its compatibility is limited to certain Evolution engine models, and professional installation might be necessary to avoid excessive engine heat or fitment issues. Compared with larger displacement options, this kit is less aggressive but offers a balanced upgrade for casual or intermediate riders.
Pros:- Easy bolt-on installation
- Enhanced engine performance
- Sleek black finish
Cons:- Limited compatibility
- May require professional install
- Potential heat increase
Best for: Owners seeking an easy, stylish upgrade with moderate power gains
Not ideal for: Those with non-compatible models or looking for maximum displacement
- Model:11-1253
- Bore Size:83 inches
- Color:Black
- Type:Big Bore Cylinder Kit
Our verdict“A solid, stylish choice for owners wanting a simple upgrade without extensive modifications.”
S&S 106 in. Big Bore Black Kit for Harley Davidson 2006-2013 FXD and Big Twin Models
This kit provides a substantial 106-inch displacement increase, making it ideal for riders seeking more horsepower and torque from their Harley. Designed specifically for 2006-2013 FXD and Big Twin models, it offers a reliable performance upgrade with a durable black finish. The main tradeoff here is installation complexity; it demands mechanical expertise to ensure proper fitment and to avoid accelerated engine wear. Compared to smaller kits, this option delivers a more aggressive boost but limits compatibility to certain model years, so it’s best suited for experienced mechanics or dedicated enthusiasts.
Pros:- Significantly increases displacement
- Designed specifically for Harley models
- Durable black finish
Cons:- Installation can be complex
- Limited to specific years/models
- Potential for increased engine wear
Best for: Performance-minded riders with compatible Harley models and mechanical skills
Not ideal for: Beginners or owners of incompatible model years
- Application:2006-2013 FXD and Big Twin
- Displacement:106 inches
- Color:Black
Our verdict“Optimal for experienced owners wanting a serious power increase on compatible Harley models.”
S&S Cycle 91-7702 96in. Big Bore Kit – Black Powder-Coat
This kit offers a 96-inch bore size and includes cylinders, pistons, rings, and gaskets, designed for owners who want a straightforward upgrade without splitting cases or boring cylinders. Made from high-quality aluminum with cast-in iron liners, it provides durability and a professional finish. The main advantage over larger displacement kits is ease of installation, making it accessible to those with mechanical skills but without extensive engine work experience. However, it is limited to certain engine models, and improper installation can lead to increased engine wear. It strikes a balance between performance and simplicity, ideal for riders who prioritize reliability and ease.
Pros:- Simple installation without case splitting
- High-quality materials
- Durable powder-coat finish
Cons:- Limited to specific engine models
- Requires mechanical knowledge
- Less displacement than larger kits
Best for: Owners seeking a reliable, easy-to-install big bore with high-quality materials
Not ideal for: Owners wanting maximum displacement or with incompatible models
- Bore Size:96 inches
- Finish:Black Powder-Coat
- Material:Aluminum with cast-in iron liners
- Includes:Cylinders, pistons, rings, gaskets
Our verdict“A dependable choice for owners who want an durable upgrade with minimal hassle.”
S&S 95 in. Twin Cam Natural Big Bore Kit for Harley Davidson 1999-2006 Twin Cam
This kit is tailored for Harley Twin Cam models from 1999 to 2006, excluding the 2006 Dyna. It offers a 95-inch displacement, boosting engine capacity and performance for classic Twin Cam owners. While it’s not compatible with Evolution engines, it’s a popular choice for those with older models looking for a reliable displacement increase. The main tradeoff is its limited compatibility, making it unsuitable for Evolution owners. The kit is well-made and designed for straightforward installation, but it requires some mechanical skill. It’s a smart option for vintage Harley owners wanting a proven upgrade.
Pros:- Increases engine capacity
- Designed specifically for Twin Cam models
- Made by reputable manufacturer
Cons:- Limited to Twin Cam engines
- Installation may require mechanical skill
- Excludes 2006 Dyna models
Best for: Owners of 1999-2006 Twin Cam Harleys wanting a proven performance boost
Not ideal for: Evolution engine owners or newer Harley models
- Displacement:95 inches
- Application:1999-2006 Twin Cam
- Includes:Various components for upgrade
Our verdict“Ideal for vintage Harley owners seeking a reliable displacement increase without complicated modifications.”
S&S 106 in. Big Bore Black Kit for Harley Davidson 2006-2013 FXD and Big Twin Models
This kit matches the performance profile of the 106-inch kits, designed for Harley FXD models from 2006-2013 and other Big Twin models. It offers a significant displacement increase for street riders wanting more power without extensive modifications. The black finish enhances durability and aesthetics. Its main drawback is the installation complexity, requiring mechanical proficiency. It’s best suited for experienced riders who want a reliable, high-displacement upgrade for street performance, but compatibility is limited to specific years and models.
Pros:- Increases displacement
- Compatible with multiple models
- Durable black finish
Cons:- Installation may be complex
- Model-year restrictions
- Potential engine wear if not installed properly
Best for: Experienced riders wanting a high-performance upgrade on compatible Harley models
Not ideal for: Beginners or owners of incompatible Harley Davidson years
- Application:2006-2013 FXD and Big Twin
- Displacement:106 inches
Our verdict“A robust choice for seasoned Harley owners aiming for a significant power boost in street riding.”
How We Picked
Our selection process focused on kits that are specifically designed for Harley Davidson Evolution Big Twin engines, emphasizing performance gains, ease of installation, and build quality. We compared compatibility across model years, evaluated the technical complexity of installation, and considered durability and finish quality. Our goal was to identify options that suit different rider needs—from those seeking simple bolt-on upgrades to enthusiasts wanting maximum displacement. Tradeoffs such as increased heat, potential wear, and installation difficulty were carefully weighed to ensure each recommendation provides clear value for a specific rider profile.
Factors to Consider When Choosing Big Bore Kit For Harley Davidson Evolution Big Twin
Selecting a big bore kit for your Harley Davidson Evolution Big Twin involves balancing power, compatibility, and ease of installation. The right choice depends on your mechanical skills, your bike’s model year, and how much displacement increase you desire. Kits range from simple bolt-ons to more complex assemblies that require case splitting. Understanding these factors helps ensure you pick a kit that not only boosts performance but also fits your riding style and maintenance capabilities.Performance Goals
Decide how much power increase you want. Smaller kits like the V-Twin 11-1253 offer moderate gains suitable for street riding and casual cruising. Larger displacement kits like the 106-inch options deliver serious horsepower but may demand more from your engine and require professional installation. Clarifying your goals helps narrow the options to those that match your expectations and riding habits.
Compatibility and Model Year
Check your Harley’s specific model year and engine type. Many kits are designed for particular years, such as the 2006-2013 FXD, or for certain engine configurations like Twin Cam or Evolution. Installing a kit that isn’t compatible can lead to fitment issues or engine damage, so verifying compatibility is essential before purchase.
Installation Complexity
Some kits, like the S&S 91-7702 96in., are designed for straightforward installation without case splitting, making them accessible for riders with mechanical skills. Others, especially larger displacement kits, may require extensive engine work or professional help. Be honest about your mechanical experience to avoid costly mistakes or incomplete installations.
Material and Finish
High-quality materials and durable finishes, such as powder-coating or anodizing, can improve the longevity of your big bore kit. These details matter if you want your upgrade to withstand the rigors of street riding and look good over time. Opt for reputable brands and finishes that resist corrosion and wear.
Tradeoffs and Considerations
Higher displacement generally means increased heat, potential engine wear, and the need for tuning or supporting modifications. Balance your desire for power with the maintenance implications. Carefully consider whether your bike’s current setup and your riding style match the demands of a high-displacement kit.
Frequently Asked Questions
Can I install a big bore kit myself?
While some smaller bolt-on kits like the S&S 91-7702 are designed for easier installation, many larger displacement kits require advanced mechanical skills and tools. If you have experience working on Harley engines, you might manage the install, but for most riders, professional installation ensures proper fitment and safety. Always follow manufacturer instructions carefully to avoid damaging your engine.
Will a big bore kit increase my engine’s heat?
Yes, increasing bore size and displacement can lead to higher engine temperatures due to increased power output and combustion heat. Adequate cooling, tuning, and sometimes upgrading your cooling system are advisable to prevent overheating. Proper installation and maintenance help mitigate these risks while maximizing performance gains.
Are larger bore kits suitable for daily riding?
Many larger bore kits provide excellent performance improvements for street riding, but they may also increase engine wear and require more maintenance. Kits like the 106-inch options are best suited for riders who understand their bike’s increased demands and are prepared to perform regular upkeep. For casual or infrequent riders, a moderate kit might be more appropriate.
Do big bore kits void Harley warranty?
Installing a big bore kit can void your Harley’s factory warranty, especially if it leads to engine damage or requires modifications that aren’t covered under warranty terms. Always check your warranty agreement and consider professional installation or OEM-approved parts to minimize risks or warranty issues.
What additional upgrades might I need with a big bore kit?
To maximize performance and reliability, you might need supporting modifications such as high-flow air filters, upgraded exhaust systems, and tuning or remapping your ECU. Ensuring your cooling system is adequate and considering a stronger clutch or transmission components can also help handle the increased power safely.
Conclusion
For riders seeking an easy upgrade with a balanced performance boost, the V-Twin 11-1253 Evolution 83 makes a compelling choice. Enthusiasts aiming for maximum displacement and street performance will find the S&S 106 in. Big Bore Black Kit (2006-2013) ideal, provided they have mechanical expertise. Those who prefer a hassle-free, durable upgrade without extensive engine work should consider the S&S Cycle 91-7702 96in. Big Bore Kit. Ultimately, your decision hinges on your mechanical skill, desired power gains, and compatibility with your specific Harley model. Carefully weigh these factors to find the big bore kit that best matches your riding goals and maintenance preferences.
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